JANYUN 120 Pairs Butterfly Clutch Tie Tacks Pin Back Replacement with 8mm Length 4mm Width Blank Pins for Craft Making (4mm, Silver)

No tools required: Butterfly clutch with spring fastener slices allow you to install and remove it easily, handy and convenient for use. Tie tacks: Clutch backs size is 11 mm in diameter；pins size is 4.5 mm in diameter, 8 mm in length , small and easy to carry,great replacement for pin clutch backs. Easy to Use:Pin backs are easy to put on and take off,pin backings uses has spring fastener,match for most metal pin or brooch,lapel pin backs firm and protective grip,your items will be kept firmly fixed,pin backs with locking function and have clasps that are easily to install and take. Sturdy and Durable: Clutch backs and blank pins are made of nickel plated brass, sturdy and light, pin backs has great grip,lock pins firmly and keep them secure. Wide Versatile:Butterfly metal pin back good for keep tie in place, lapel pins,tie tacks, name tag, toy pins, citation bars, jewelry making, badges insignia,service bar, etc.make some DIY crafts pins,locking pin backs or homemade projects